Dynamo-electric machine.



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\d d. d o u o N Arlo/swf VS UNITED STATES HPATENT"rricn,

GUsTAn DALN AND ARTHUR r-TULTQvrsr, oF STOCKHOLM, SWEDEN.

DYNAMIC-ELECTRIC MACHINE.

srncrrrcATroN forming part of' Letters Patent No. 645,943, dated March27, 190e.

Application filed October 5, 1899.

To @ZZ Loh-0m it may corr/berlin Y p y Be it known that we, GUSTAF DALNand ARilIUlt HULTQVIST, engineers, residing at Stockholm, Sweden, haveinvented certain Improvements in Dynamo-Electric Machines, of which thefollowing is a specification.

It has been proposed to construct on'e-poled dynamo-electric machines bymeans of two rotating disks of steel, copper, or other suitablematerial, which disks have been placed within magnetic iields in such amanner that electromotive force is generated in the direction from thecenter of one disk to the center of the other disk. In order to conductthis electromotive force from one disk to the other disk, a belt or bandof a suitable iieXible and conducting material has been used, which beltor band was laid aroundv the two rotating disks.

I-Iitherto d ynamo-electric machines ofl that kind have had only alimited employment on account ofthe large dimensions which they re-'ceive when constructed for a high voltage, as it was not possible togive the said disks a rotation greater than that determined by thestrength of the belt or band.

The present invention has for its object to avoid said inconvenience;and it consists therein that the electromotive force is conducted fromone disk to the other disk by means of direct contact establishedbetween the disks,which for this purpose are pressed toward each otherat or near the circumference. Owing to this contact between the disksthey may be driven with a considerablyhigh speed, the ratio of speedbeing limited only by the strength of the disks. When constructedaccording to this invention, the machines will be cheap to manufactureand will receive small dimensions, on deliveringa current with a desiredvoltage.

The accompanying drawings show the improved dynamo-electric machine.

Figure l is a vertical section of the machine.l Fig. 2 is a side view ofthe same. Fig. 3 shows, schematically, the arrangement of two sets ofrotating disks. Fig. 4 shows on a larger scale a modied construction ofthe outer rings of the disks in order to assure a good contact betweenthe disks. Fig. 5 is a detail view showing the rified rings.

l and 2 indicate the rotating.disks,mounted Serial No. 732,692. (Nomodel.)

on the shafts 3 and 4 and pressed toward each other at thecircumference. The disks rotate in opposite directions and aresituated'in mag-` netic fields 5 6, 6 7 Said magnetic fields arearranged in such a manner that the magnetic lines of force pass from theleft to the right through the disk l as well as through the disk 2,asindicated by the arrows, and pass through the armature from the right tothe left. Thus an electro motive force is generated in the disk 1in thedirection from the center of the disk to the circumference, while in thedisk 2 the electromotive force has the direction from thecircumference'of the disk to its center. The electromotive force isconducted from the one disk to the other at the circumferen# tial pointof contact betweenv the two'disks,v andthus a total electromotive forceis'generated in the direction from the center of the disk l to thecenter of the disk 2. of sliding contacts 8 and 9 upon the shafts 3 and4 the electric current may be gathered and conducted to the places forits employ'- ment.

By means` Fig. 4 shows a construction of the outer y rings of the disksl and 2 in order to obtain a const-ant pressure between the disks. Forthis purpose the outer ring projects sidewise and the centerlines of thedisks are displaced r vat high speeds, for assuring a good contact.

The outer rings of the disks may also be made yielding in other waysthan shown in the drawings. They may, if desired, be ritled in order toprovide a larger surface of contact between the'disks. For the purposeof opposing less resistance at the point of contact between the twodisks the rings of the disks may be coated with a good conductor--forinstance, copper-if the `disks are not themselves made of a goodconducting material. Instead of using only two rotating disks, as shown,three or more disks may be employed, which are in contact with eachother at or near the circumference. The magnetic fields in which saiddisks 'rotate are in this case arranged in such a manner thatelectromotive force is transmitted at the point of contact between twodisks from one disk to the other IDO diske This disposition may be clearwithout upon the shaft 15.

sets of rotating disks may also be employed and the magnetic eld Withinsaid sets arranged in such a manner that the electromotive forcesgenerated in each set of disks are added. Fig. 3 shows, schematically, adynamo-electric machine in which two sets of rotating disks areemployed. 11 indicate the disks in the one set, 12 13 the disks in thesecond set. The disks 10 and 12 are mounted upon the shaft 14 and thedisks 11 and 13 Within the set 10 11 the magnetic elds are arranged insuch a manner that electromotive force is generated in the directionfrom the center of the disk 10 to the center of the disk 11. lVithin theset 12 13 the direction of the electromotive force is from the center ofthe disk 13 to the center oi the disk 12. Using one of the shafts; forinstance, 14-as conductor between the two groups a total electromotiveforce is genera-ted in the direction from the center of the disk 13 tothe center of the disk 11, and by means of` sliding contacts 16 17 onthe shaft the generated electricl current may be conducted tothe placesfor its consumption. It may be observed that the part of the shaft 15situated between the outer sets otdisks must be insulated from thedisks. It will be understood that instead of using the shaft 14 asconductor between the sets any suitable conductor which rotates with thedisks may be employed.

Having now particularly described and ascertained the nature of the saidinventionand in what manner the sa'me isto be performed, we declare thatwhat we claim isn 1. In a dynamo-electric machine, the combination oftwo or more rotating disks, which are in contact with one another at ornear the periphery, and magnetic fields, in which said disks rotate, soarranged that electromotive force is generated in the direction from thecenter of one disk to the center of another disk, substantially asdescribed and for the purpose set forth.

2. In a dynamo-electric machine, the combination of two or more rotatingdisks, which are in contact with one another by means of their outeryielding rings,and magnetic iields, in which said disks rotate, soarranged, that electromotive force is generated in the direction fromthecenter ot one disk to the center of another disk, substantially asdescribed and for the purpose set forth.

3. In a dynamo-electric machine the combination of two or more rotatingdisks, which are in contact with one another by means of their outerriled rings', and magnetic fields, in'which the disks rotate, soarranged, that electromotive force is generated in the direction fromthe center of one disk to the center of another'disk; substantially asdescribed andfor the purpose set forth.

4. In a dynamo-electric machine the combination of two or more sets ofrotating disks, which are in contact with one another at or near theperiphery, magnetic fields, in which said disks rotate, so arranged,that the elec.

tromotive forces, generated within the several sets, are added, and aconductor between the sets of disks, rotating with the diskssubstantially' as described and for the purpose set forth. f

In testimony thatwe claim the foregoing as our invention we have signedour names in presence ot' two subscribing witnesses.

GUsrAr DALN. ARTHUR nULfrovisr.

fitnesscs :y

WALDEMAR BoMAN, H. RIDDERsToLPE.

